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DI-447
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
DI4D6-05
DTC B0137/71 Short in P/T Squib (LH) Circuit (to
Ground)
CIRCUIT DESCRIPTION
The P/T squib (LH) circuit consists of the airbag sensor assembly and seat belt pretensioner (LH).
It causes the SRS to deploy when the SRS deployment conditions are satisfied.
For details of the function of each component, see OPERATION on page RS-2 .
DTC B0137/71 is recorded when a ground short is detected in the P/T squib (LH) circuit.
DTC No. DTC Detecting Condition Trouble Area
S Short circuit in P/T squib (LH) wire harness (to ground) S Seat belt pretensioner (LH)
B0137/71 S P/T squib (LH) malfunction S Airbag sensor assembly
S Airbag sensor assembly malfunction S Wire harness
WIRING DIAGRAM
See page DI-440 .
INSPECTION PROCEDURE
1 Prepare for inspection (See step 1 on page DI-486 ).
2 Check P/T squib (LH) circuit.
CHECK:
P/T Squib (LH)
For the connector (on the seat belt pretensioner side) between
the seat belt pretensioner (LH) and the airbag sensor assembly,
Airbag
Sensor measure the resistance between PL+ and body ground.
Assembly OK:
Resistance: 1 M or Higher
PL+
(-) (+)
NG Repair or replace harness or connector be-
tween seat belt pretensioner (LH) and airbag
H01016 sensor assembly.
H08392 H08396
OK
2001 SIENNA (RM787U)
Author : Date : 601
DI-448
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 Check airbag sensor assembly.
PREPARATION:
(a) Connect the connector to the airbag sensor assembly.
Airbag
(b) Using a service wire, connect PL+ and PL- of the connec-
P/T Squib (LH) Sensor
Assembly tor (on the seat belt pretensioner side) between the seat
belt pretensioner (LH) and the airbag sensor assembly.
(c) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
PL+ PL- ACC ON
CHECK:
(a) Turn the ignition switch to ACC or ON and wait at least for
20 seconds.
or (b) Clear the DTC stored in memory
(See step 5 on page DI-358 ).
DLC1 DTC B0137/71 (c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
E1 Tc (e) Check the DTC (See page DI-358 ).
H01017 OK:
H02139
AB0118 AB0119 DTC B0137/71 is not output.
R13006 H01084 H02216
HINT:
Codes other than code B0137/71 may be output at this time, but
they are not relevant to this check.
NG Replace airbag sensor assembly.
OK
2001 SIENNA (RM787U)
Author : Date : 602
DI-449
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 Check P/T squib (LH).
PREPARATION:
(a) Turn the ignition switch to LOCK.
Airbag (b) Disconnect negative (-) terminal cable from the battery,
P/T Squib (LH) Sensor
and wait at least for 90 seconds.
Assembly
(c) Connect the seat belt pretensioner (LH) connector.
(d) Connect negative (-) terminal cable to the battery, and
wait at least for 2 seconds.
ACC ON
CHECK:
(a) Turn the ignition switch to ACC or ON, and wait at least
or
for 20 seconds.
(b) Clear the DTC stored in memory
DLC1 (See step 5 on page DI-358 ).
DTC B0137/71 (c) Turn the ignition switch to LOCK, and wait at least for 20
seconds.
(d) Turn the ignition switch to ACC or ON, and wait at least
for 20 seconds.
E1 Tc (e) Check the DTC (See page DI-358 ).
H01018
OK:
AB0118 AB0119
R13006 H01084 H01220 DTC B0137/71 is not output.
HINT:
Codes other than code B0137/71 may be output at this time, but
they are not relevant to this check.
NG Replace seat belt pretensioner (LH).
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check. If the malfunctioning part can not be
detected by the simulation method, replace all SRS components including the wire harness.
2001 SIENNA (RM787U)
Author : Date : 603
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